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> "Front main" seal on a /6, Any tips, traps or suggestions?
BigD9146gt
post Feb 2 2005, 09:46 PM
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OT, hey guys, i'm new at this, whats DWD?... Besides my startup company (DonWelchDesign)
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J P Stein
post Feb 3 2005, 02:43 AM
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QUOTE (BigD9146gt @ Feb 2 2005, 07:46 PM)
OT, hey guys, i'm new at this, whats DWD?... Besides my startup company (DonWelchDesign)

http://www.914world.com/bbs2/index.php?act=...699&hl=dwd&st=0

About half way down the first page.
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larryM
post Mar 2 2005, 04:51 PM
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QUOTE (Cap'n Krusty @ Feb 2 2005, 06:36 PM)
I REALLY don't want to tell you all this, but the odds are heavily against the leak being the seal. In nearly every engine I've seen with pulley leaks (in 32+ years), it's been the o-ring on the #8 main bearing. The seal, BTW, is installed IN the bearing, and the bearing is installed in the case. Granted, there are hose and fitting leaks, pressure and temp sender leaks, and occasionally leaks at the counter shaft gasket, but leaks from behind the pulley are rarely the seal. BTW, this is especially true for the light alloy cases. The fix is a case split, and a quality engine gasket set. The Cap'n

I fought this last year; pulled the engine; leak indeed turned out to be the gasket on the intermediate cover
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Gint
post Mar 2 2005, 10:22 PM
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QUOTE (Cap'n Krusty Posted on Feb 2 2005 @ 07:36 PM)
I REALLY don't want to tell you all this, but the odds are heavily against the leak being the seal. In nearly every engine I've seen with pulley leaks (in 32+ years), it's been the o-ring on the #8 main bearing. The seal, BTW, is installed IN the bearing, and the bearing is installed in the case. Granted, there are hose and fitting leaks, pressure and temp sender leaks, and occasionally leaks at the counter shaft gasket, but leaks from behind the pulley are rarely the seal. BTW, this is especially true for the light alloy cases. The fix is a case split, and a quality engine gasket set. The Cap'n


Can someone explain this to me. #8 main bearing o-ring? O-ring? Huh? Got pics?
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ClayPerrine
post Mar 2 2005, 10:29 PM
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Here you go.... #27 is the O-ring that goes around the outside of the bearing (#25)





Attached thumbnail(s)
Attached Image
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JoeSharp
post Mar 2 2005, 10:57 PM
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Rusty: It's nice to know that i"m not the only one with DWD.
(IMG:http://www.914world.com/bbs2/html/emoticons/smoke.gif) Joe
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Gint
post Mar 2 2005, 11:07 PM
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Thanks Clay. And just how does one go about replacing that bad boy?
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TimT
post Mar 2 2005, 11:29 PM
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QUOTE
And just how does one go about replacing that bad boy?


You split the case

depending what year engine you have there are different o-rings available, I think for the 2.7 and later the improved the o-ring has a slightly larger diameter (thicker) rubber, which can be used on the earlier nose bearings...but not vice versa
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Gint
post Mar 2 2005, 11:33 PM
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Thanks Tim. That's exactly the answer I didn't want to hear. (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif)
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Cap'n Krusty
post Mar 2 2005, 11:47 PM
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BTW, there's NO sealant in there, just the case, the bearing, and the o- ring. Sealant prevents the seal between the o-ring and the metal, and it'll leak. The Cap'n
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Gint
post Mar 2 2005, 11:52 PM
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How did I KNOW you'd say that?

Hi John. (IMG:http://www.914world.com/bbs2/html/emoticons/wavey.gif)
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914efi
post Mar 3 2005, 05:09 PM
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I have this leak also. You can support the engine, remove the front mount and sheetmetal and run the engine while observing to determine where the leak is coming from(remove the fan pulley also). You can replace the countershaft cover seal at his point if it needs it. I assume you can also replace the seal on the crank, but I did not attempt once I could see that the oil was coming from around the bearing and not the seal.

I have tried many things to fix, but the most successful was sealing the front motor mount to the engine and putting a drain in the bottom. I then collect the oil in a section of hose with a plug that I can remove to drain it. The oil still gets through the top of the engine area, but I don't feel like tearing it apart to fix this.
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ArtechnikA
post Mar 3 2005, 06:32 PM
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if it's any consolation, LB, the 911 leaks there too, and the engine will be getting a total rehab RSN...
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J P Stein
post Mar 3 2005, 07:14 PM
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Well, Capt'n, some folks run a bead of case sealer around the
Bearing *away* from the the O ring....pick a guru, cause there's conflicting advice. I chose not to & slathered silicome grease all over and it leaks. Same with the verticle chain case
gasket. No gasket sealent and one leaks, the other don't.
Shit happens, eh?
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